This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 12 |
| 3 | 180 |
| 4 | 1680 |
| 5 | 12600 |
| 6 | 166320 |
| 7 | 2522520 |
| 8 | 576576 |
| 9 | 22054032 |
| 10 | 465585120 |
| 11 | 2560718160 |
| 12 | 64250746560 |
| 13 | 348024877200 |
| 14 | 1124388064800 |
| 15 | 4990906206000 |
| 16 | 165032631878400 |
| 17 | 350694342741600 |
| 18 | 2599263952084800 |
| 19 | 101515697684200800 |